Season the chicken with sofrito, salt, and adobo, making sure everything is well coated.
Heat the olive oil in a large pot over medium heat. Add the chicken and cook for about 3 minutes on each side, just lightly searing it. You don’t want to brown the chicken.
Add the onion, celery, carrots, and garlic. Cook for a few minutes, then add the water. Bring the soup to a boil.
Once it comes to a boil, add the sazón, adobo, salt, oregano, and allspice. Lower the heat and let the soup cook for about 30 minutes.
Add the corn, kabocha squash, potatoes, and parsley. Cook for another 30 minutes, or until the potatoes are tender.
Remove the parsley, then add the fideos and cook for about 10 minutes, until the noodles are tender.
Serve hot with white rice and avocado on the side. Buen provecho!